Aaron, that's not exactly all it by a longshot but you're on the right track. However, the devil is in the details.
To note, it was recently commented that Ido Portal was working 5-10 holds of 10-20s straddle planche when he could perform a straight body planche for 3-5 seconds. His words were volume simply put. It was something like that.
When your work sets are longer, it seems you can use shorter recovery periods as well. Big difference needed between a 3-5s hold and a 15s hold...when they are done at 50% of max hold. Different if it's a max hold.
The one caveat is that the next progression is not taxing your joints or tendons too much causing some form of overuse injury.